Change on Soluble Carbon and Nitrogen in Cow Bed Material during Composting
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摘要:
目的 探讨在外源菌剂作用下使用了3年的牛床垫料堆肥发酵过程可溶性氮和碳变化的规律。 方法 测定不同菌剂作用后牛床垫料发酵过程不同发酵时间可溶性氮(铵态氮、硝态氮、可溶性有机氮)和可溶性碳(可溶性总碳和可溶性有机碳)的含量。 结果 添加菌剂促进了牛床垫料发酵过程铵态氮(NH4+-N)、可溶性有机氮(SON)和可溶性总碳(STC)含量的增加,降低了硝态氮(NO3−-N)含量,其中国龙生物床菌剂作用最明显,百丰畜禽宝和丰力净次之;可溶性有机碳(SOC)在不同的菌剂之间作用无规律性。随着发酵时间延长,NH4+-N和STC含量呈先增后降的变化趋势,发酵20 d含量最高;NO3−-N和SON呈增加趋势,发酵50 d含量最高;SOC呈降低趋势,发酵10 d含量最高。 结论 添加菌剂能增加发酵过程铵态氮、SON和STC含量,但可能存在氨挥发的风险。综合考虑堆肥降解效果和减少氨气的挥发,牛粪垫料发酵宜选专用畜禽粪便发酵的菌剂。 Abstract:Object Changes on soluble carbon and nitrogen in cow bed material during composting with the aid of various exogenous bacterial fermentation agents were studied. Method Contents of soluble nitrogen, i.e., ammonium nitrogen (NH4+-N) and nitrate nitrogen (NO3−-N), soluble organic nitrogen (SON), and soluble carbon, i.e., soluble total carbon (STC) and soluble organic carbon (SOC) in the cow bed material, which had been used at a cattle ranch for 3 years, that was added with different commercially available bacteria agents were measured during the fermentation to determine the optimal application of the agents. Results The addition of fermentation agents increased NH4+-N, SON, and SOC, but reduced NO3−-N. Among the 3 agents tested, Guolong Biological Bed Inoculants performed best on most evaluation criteria, and it was followed by Baifeng Livestock and Poultry Bao and Feng Li Jing. No consistent display in SOC by the agents was observed. NH4+-N and STC increased to peak in 20 d and declined afterward. NO3−-N and SON tended to increase continuously to reach a maximum in 50 d. The SOC content toped in 10 d and then on a decreasing trend as the fermentation progressed. Conclusion The application of bacteria agents could increase the available carbon and nitrogen in the compost. However, there was the risk of increasing ammonia volatilization. Hence, an agent specific for the fermentation of livestock and poultry excrement would be recommended to be added to the compost for the fermentation of cow bed material. -
表 1 堆肥原料的基本组分
Table 1. Major physiochemical properties of compost materials
原料 Raw material N/% P2O5/% K2O/% C/% C/N 含水量 Water content% 质量分数 Mass faction% 牛床垫料 Cow bed material 1.68 0.78 0.92 38.17 22.68 60 70 猪粪 Pig manure 2.04 2.05 0.90 40.02 19.62 70 20 甘蔗渣 Sugar cane residue 0.39 0.09 0.25 41.00 105.00 42 10 表 2 双因素方差分析结果
Table 2. Results of two-way analysis variance
因素 Factor NH4+-N NO3−-N SON STC SOC F Sig. F Sig. F Sig. F Sig. F Sig. 校正模型 Correction model 52.504 0.000 30.92 0.000 12.301 0.000 9.526 0.000 70.97 0.000 菌剂 Inoculants 33.61 0.000 9.432 0.000 12.28 0.000 8.275 0.000 234.3 0.000 取样时间 Sampling time 219.86 0.000 96.237 0.000 42.869 0.000 31.8 0.000 59.42 0.000 菌剂×取样时间 Inoculants×Sampling time 14.414 0.000 20.002 0.000 4.667 0.000 4.256 0.000 32.42 0.000 表 3 不同处理样品NH4+-N、NO3−-N、SON、STC和SOC含量
Table 3. Contents of NH4+-N, NO3−-N,SON, STC, and SOC in treatment samples
项目Item NH4+-N NO3−-N SON STC SOC CK 0.810±0.132 d 0.837±0.123 a 1.309±0.165 d 11.301±0.440 bc 11.104±0.484 b EM 1.101±0.155 cd 0.601±0.088 b 1.879±0.203 c 10.606±0.794 c 8.968±0.433 c BF 1.592±0.200 b 0.491±0.044 b 2.124±0.164 bc 12.259±0.502 b 12.692±0.405 a FLJ 1.379±0.179 bc 0.589±0.063 b 2.257±0.227 b 12.534±0.642 b 13.743±0.772 a GR 2.094±0.322 a 0.591±0.083 b 2.825±0.319 a 14.135±0.736 a 8.394±0.440 c 注:表中同列数字后不同小写字母表示差异显著(P<0.05),下同。表中不同菌剂处理可溶性氮和碳的含量为5次取样的平均值。
Note: Data with different lowercase letters on same column mean significant difference at p<0.05. Contents of soluble nitrogen and carbon are average of 5 replicates.表 4 不同取样时间NH4+-N、NO3--N、SON、STC和SOC含量
Table 4. Contents of NH4+-N, NO3−-N,SON, STC, and SOC in samples at different sampling times
取样时间 Sampling time/d NH4+-N NO3−-N SON STC SOC 10 0.841±0.120 c 0.295±0.042 c 0.891±0.156 d 10.647±0.472 b 12.748±0.427 a 20 3.387±0.121 a 0.352±0.042 c 1.651±0.154 c 15.494±0.466 a 11.100±0.427 b 30 1.844±0.120 b 0.393±0.042 c 2.022±0.158 b 14.235±0.466 a 11.173±0.427 b 40 0.818±0.120 c 0.810±0.042 b 2.176±0.165 b 9.098±0.466 c 9.754±0.444 c 50 0.087±0.120 d 1.258±0.042 a 3.654±0.154 a 11.36±0.466 b 9.86±0.427 c 注:表中不同取样时间可溶性氮和碳的含量为所有处理在该时间的平均值。
Note: Contents of soluble nitrogen and carbon at different sampling times are average of all treatments.表 5 不同形态氮和碳随发酵时间变化的回归方程
Table 5. Regression equation for dynamic changes of different forms of nitrogen and carbon at various fermentation times
碳/氮形态 Carbon/nitrogen form 回归方程/Regression equation R2 F Sig. NH4+-N y=−6.538+1.08x−0.037x2+0.0001x3 0.583 102.46 0.000 NO3−-N y=1.761−0.246x+0.012x2+0.0001x3 0.401 49.18 0.000 SON y=−1.581+0.351x−0.012x2+0.0001x3 0.347 37.78 0.000 STC y=−9.831+3.00x−0.108x2+0.001x3 0.285 29.301 0.000 SOC y=11.378−0.313x+0.019x2+0.001x3 0.611 115.14 0.000 注:x为时间,y为不同形态碳氮含量。
Note: x: sampling time; y: different forms of nitrogen and carbon. -
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